A timestamp field contains a Unix timestamp as a 32-bit integer, representing the number of elapsed seconds since January 1, 1970 00:00:00 GMT.

The value is text describing an absolute or relative date.

Packages

As JSON from packages:

Relative dates

{
	"created": "-1 week 8am"
}

Absolute dates

{
	"updated": "Jan 1 2019 13:00:00 +0000"
}

Unix timestamps (as seconds)

{
	"created": 1550080259
}

Records API

In PUT or POST requests from the API:

&fields[timestamp]=1550080259